Primordial black holes (PBHs) were born from primordial perturbations in highly overdense regions by gravitational collapse [1]}, [2]}, [3]}. Among modern mechanisms of PBHs formation, the inflationary origin [4]}, [5]}, [6]}, [7]}, [8]} tightly connects the PBHs properties such as mass distribution [9]}, abundance distribution [10]}, [11]}, [12]}, [13]}, the fraction of PBHs in dark matter [14]} with the early universe evolution. Thus, the observational constraint on PBHs provides important clues for inflationary model building.
